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Known exploited vulnerability

CVE-2020-1147

highCVSS 3.1 7.8In CISA KEVEPSS 96%Published · Microsoft

The short answer

CVE-2020-1147 affects Microsoft Microsoft SharePoint Enterprise Server and is rated high (CVSS 7.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2021-11-03: attackers are using it, so patch it first. Fixed versions are published for Microsoft.NETCore.App (2.1.20) and Microsoft.NETCore.App.Runtime.linux-arm (3.1.6).

What it is

A remote code execution vulnerability exists in .NET Framework, Microsoft SharePoint, and Visual Studio when the software fails to check the source markup of XML file input, aka '.NET Framework, SharePoint Server, and Visual Studio Remote Code Execution Vulnerability'.

Severity

7.8 high

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploited (CISA KEV)

Yes, since Nov 3, 2021

Federal due date May 3, 2022

EPSS, next 30 days

96%

Higher than 100% of scored CVEs

How it can be exploited

Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

Apply updates per vendor instructions.

Affected packages and fixed versions

PackageEcosystemFixed inAdvisory
Microsoft.NETCore.AppNuGet2.1.20GHSA-g5vf-38cp-4px9
Microsoft.NETCore.App.Runtime.linux-armNuGet3.1.6GHSA-g5vf-38cp-4px9
Microsoft.NETCore.App.Runtime.linux-arm64NuGet3.1.6GHSA-g5vf-38cp-4px9
Microsoft.NETCore.App.Runtime.linux-musl-arm64NuGet3.1.6GHSA-g5vf-38cp-4px9
Microsoft.NETCore.App.Runtime.linux-musl-x64NuGet3.1.6GHSA-g5vf-38cp-4px9
Microsoft.NETCore.App.Runtime.linux-x64NuGet3.1.6GHSA-g5vf-38cp-4px9
Microsoft.NETCore.App.Runtime.osx-x64NuGet3.1.6GHSA-g5vf-38cp-4px9
Microsoft.NETCore.App.Runtime.rhel.6-x64NuGet3.1.6GHSA-g5vf-38cp-4px9
Microsoft.NETCore.App.Runtime.win-armNuGet3.1.6GHSA-g5vf-38cp-4px9
Microsoft.NETCore.App.Runtime.win-arm64NuGet3.1.6GHSA-g5vf-38cp-4px9
Microsoft.NETCore.App.Runtime.win-x64NuGet3.1.6GHSA-g5vf-38cp-4px9
Microsoft.NETCore.App.Runtime.win-x86NuGet3.1.6GHSA-g5vf-38cp-4px9

Is it in your code? Drop your lockfile into the free vulnerability check, or let vulnerability watch check your repository every day and open the upgrade as a pull request.

Affected products

Microsoft SharePoint Enterprise Server, Microsoft SharePoint Server, Microsoft Visual Studio 2019, Microsoft Visual Studio 2019 version 16.6 (includes 16.0 - 16.5), Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8), Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3), .NET Core, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems, Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation), Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2020-1147 being exploited?

Yes. CISA added CVE-2020-1147 to its Known Exploited Vulnerabilities catalog on 2021-11-03, with a federal remediation due date of 2022-05-03.

How do I fix CVE-2020-1147?

Upgrade to a fixed version: Microsoft.NETCore.App (NuGet) 2.1.20; Microsoft.NETCore.App.Runtime.linux-arm (NuGet) 3.1.6; Microsoft.NETCore.App.Runtime.linux-arm64 (NuGet) 3.1.6; Microsoft.NETCore.App.Runtime.linux-musl-arm64 (NuGet) 3.1.6. CISA's required action: Apply updates per vendor instructions.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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